SIGNALS:
Shunting signals
Signals used for shunting purposes are distinct from stop signals as their function is different. They do not indicate that the line ahead is clear, but that movements may proceed as far as the line is clear.
On a signal post
Shunting signals can be in the form of a miniature semaphore arm, mounted on a signal post.
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| Lower quadrant | Somersault | Upper quadrant | Colour-light |
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Ground signals
Ground signals are mounted at ground level – you’d never have guessed! Many have the arm superimposed on a white or black disc to aid visibility. This type is generally called a disc signal, or in the case of the colour-light type, a position-light ground signal.
Their meaning is exactly the same as the miniature-arm signals above.
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| Lower quadrant | Upper quadrant | Colour-light |
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Yellow shunting signals
Shunting signals with yellow arms (with, sometimes, a black band) are usually found at the outlet of sidings where there is also a head-shunt.
Signals of this type should not be confused with Distant signals, as their purpose is quite different. The function is similar to that of the red arm shunting signal, with one additional feature. It may be passed when on for shunting movements along the headshunt. This saves frequent operation of the signal when shunting is taking place.
In well-lit locations, such as marshalling yards, a small yellow arm does not show well in artificial light and a black background is provided on discs to make the indication clearer.
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| Lower quadrant | Upper quadrant | Colour-light |
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